<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
export default {
  name: 'App',
  data() {
    return {
      timer: null
    }
  },
  created() {
    // 在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem('store')) {
      this.$store.replaceState(
        Object.assign(
          {},
          this.$store.state,
          JSON.parse(sessionStorage.getItem('store'))
        )
      )
    }
    // 在页面刷新时将vuex里的信息保存到sessionStorage里
    // beforeunload事件在页面刷新时先触发
    window.addEventListener('beforeunload', () => {
      sessionStorage.setItem('store', JSON.stringify(this.$store.state))
    })
  },
  provide() {
    return {
      reload: this.reload
    }
  },
  destroyed() {
    clearInterval(this.timer)
  },
  methods: {
    initTheme() {
      this.$store
        .dispatch('GetThemes')
        .then(res => {
          this.timer = setTimeout(this.initTheme, 60 * 1000)
        })
        .catch(error => {
          console.log(error)
        })
    }
  }
}
</script>
